The document provides examples of using various graphics, sound, and threading capabilities in the Ring programming language using the Allegro library. It demonstrates how to load and display bitmaps, play sound files, scale and rotate images, use transparency, and create threads. Code samples are provided to illustrate drawing bitmaps, text, loading TrueType fonts, reserving samples, playing sounds, and having multiple threads execute loops and output text.

1. Ring Documentation, Release 1.5.1
al_draw_bitmap(bouncer, bouncer_x, bouncer_y, 0)
al_flip_display()
ok
callgc()
end
al_destroy_timer(timer)
al_destroy_allegro_event(ev)
al_destroy_allegro_timeout(timeout)
al_destroy_event_queue(event_queue)
al_destroy_bitmap(bouncer)
al_destroy_bitmap(image)
al_destroy_display(display)
Note: In the previous example we used the function callgc() which is a Ring function to force calling the Garbage
collector inside the While/End loop.
Program Output:
At first the program display a messagebox
Then we see two rectangles are moving on the screen
50.1. Drawing, Animation and Input 415

2. Ring Documentation, Release 1.5.1
Then we see an image displayed on the screen
50.1. Drawing, Animation and Input 416

3. Ring Documentation, Release 1.5.1
Finally we have one rectangle, and we see it moving all of the time on the screen but we can control it using the Mouse
and/or the Keyborad
50.1. Drawing, Animation and Input 417

4. Ring Documentation, Release 1.5.1
50.2 Using TrueType Fonts
In this example we will see how to use TrueType Fonts *.ttf in our Games using Allegro
Load "gamelib.ring"
al_init()
al_init_font_addon()
al_init_ttf_addon()
display = al_create_display(800,600)
al_clear_to_color(al_map_rgb(0,0,255))
font = al_load_ttf_font("pirulen.ttf",14,0 )
al_draw_text(font, al_map_rgb(255,255,255), 10, 10,ALLEGRO_ALIGN_LEFT,
"Welcome to the Ring programming language")
al_flip_display()
al_rest(2)
al_destroy_display(display)
Screen Shot:
50.2. Using TrueType Fonts 418

5. Ring Documentation, Release 1.5.1
50.3 Playing Sound Files
The next example play a sound file
Load "gamelib.ring"
al_init()
al_install_audio()
al_init_acodec_addon()
al_reserve_samples(1)
sample = al_load_sample( "footstep.wav" )
sampleid = al_new_allegro_sample_id()
al_play_sample(sample, 1.0, 0.0,1.0,ALLEGRO_PLAYMODE_LOOP,sampleid)
display = al_create_display(640,480)
al_clear_to_color(al_map_rgb(0,0,255))
al_flip_display()
al_rest(10)
al_destroy_allegro_sample_id(sampleid)
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6. Ring Documentation, Release 1.5.1
al_destroy_sample(sample)
al_destroy_display(display)
al_exit()
50.4 Scaling and Rotating Images
The next example display and rotate an image
Load "gamelib.ring"
al_init()
al_init_image_addon()
display = al_create_display(640,480)
al_set_target_bitmap(al_get_backbuffer(display))
al_clear_to_color(al_map_rgb(255,255,255))
image = al_load_bitmap("man2.jpg")
al_draw_rotated_bitmap(image,0,0,250,250,150,0)
al_draw_scaled_bitmap(image,0,0,250,250,20,20,400,400,0)
al_flip_display()
al_rest(2)
al_destroy_bitmap(image)
al_destroy_display(display)
Screen Shot:
50.4. Scaling and Rotating Images 420

7. Ring Documentation, Release 1.5.1
50.5 Display Transparent Image
The next example display image with white background on another image
Load "gamelib.ring"
al_init()
al_init_image_addon()
display = al_create_display(640,480)
imageback = al_load_bitmap("palace.jpg")
al_draw_bitmap(imageback,0,0,0)
image = al_load_bitmap("man4.png")
al_convert_mask_to_alpha(image,al_map_rgb(255,255,255))
al_draw_bitmap(image,0,0,0)
al_flip_display()
al_rest(10)
al_destroy_bitmap(image)
al_destroy_display(display)
50.5. Display Transparent Image 421

8. Ring Documentation, Release 1.5.1
Screen Shot:
50.6 Using Threads
In this example we will learn how to use threads from the Allegro library
Load "gamelib.ring"
o1 = new mythreads
Func Main
al_init()
for k = 1 to 5
al_create_thread("o1.thread1()")
al_create_thread("o1.thread2()")
al_create_thread("o1.thread3()")
next
al_rest(2)
Class Mythreads
cAppName = "Threads Application"
50.6. Using Threads 422

9. Ring Documentation, Release 1.5.1
Func Thread1
for x = 1 to 5
see x + nl
next
See 'Thread(1) : Application Name : ' + cAppName + nl
Func Thread2
for x = 1 to 5
see '*****' + x + nl
next
See 'Thread(2) : Application Name : ' + cAppName + nl
Func Thread3
for x = 1 to 5
see '!!!!' + x + nl
next
See 'Thread(3) : Application Name : ' + cAppName + nl
Output:
1
2
3
4
5
Thread(1) : Application Name : Threads Application
*****1
*****2
*****3
*****4
*****5
Thread(2) : Application Name : Threads Application
!!!!1
!!!!2
!!!!3
!!!!4
!!!!5
Thread(3) : Application Name : Threads Application
1
2
3
4
5
Thread(1) : Application Name : Threads Application
!!!!1
!!!!2
!!!!3
!!!!4
!!!!5
Thread(3) : Application Name : Threads Application
*****1
*****2
*****3
*****4
*****5
Thread(2) : Application Name : Threads Application
*****1
*****2
50.6. Using Threads 423

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*****3
*****4
*****5
Thread(2) : Application Name : Threads Application
!!!!1
!!!!2
!!!!3
!!!!4
!!!!5
Thread(3) : Application Name : Threads Application
1
2
3
4
5
Thread(1) : Application Name : Threads Application
*****1
*****2
*****3
*****1
*****4
*****2
!!!!1
*****5
*****3
1
!!!!2
Thread(2) : Application Name : Threads Application
1
*****4
!!!!1
2
!!!!3
!!!!4
*****5
!!!!2
3
2
!!!!5
Thread(2) : Application Name : Threads Application
!!!!3
4
3
Thread(3) : Application Name : Threads Application
!!!!4
5
4
!!!!5
Thread(1) : Application Name : Threads Application
5
Thread(3) : Application Name : Threads Application
Thread(1) : Application Name : Threads Application
50.6. Using Threads 424